Water-tube boiler.



Patented Sept ll, I900.

J. PLATT;

WATER TUBE BOILER.

(Application filed Feb. 23, 1899.)

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UNITED STATES PATENT OFFICE.

JOHN PLATT, OF WESTFIELD, NEW JERSEY.

WATER-TUBE'BOILER.

SPECIFICATION forming part of Letters Patent N 0. 657,614, datedSeptember 11, 1900.

Application filed February 23, 1899. Serial No. 706,468.

To aZZ whom it may concern-- Be it known that 1, JOHN PLATT, a subjectof the Queen of Great- Britain and Ireland, residing at Westfield,county of Union, and

State of New Jersey, have invented certain new and useful Improvementsin Water-Tube- Boilers, fully described and represented in the followingspecification and the accompanying drawings, forming a part of the same.

This invention relates to certain improvements in that class ofwater-tube boilers in which a plurality of waterdrums located alongsidea grate or a series of grates is used in connection withsteam-separating means, such as an upper steam drum or drums, thesteam-separating means being connected to the water-drums by means ofgroups of tubes through which a circulation between the water-drums andthe steam-separating means is attained, the groups of tubes beingarranged to be exposed to the gases and other heated products ofcombustion rising from the fire.

It is the object of this invention to so arrange the connecting-tubes inboilers of the class described as to insure a long-continued contactbetween the products and both the tubes and the steam-separating meansand to also provide for maintaining a free draft from the fire.

With this and other objects in view the invention consists in certainparts, improvements, and combinations, all of which will be fullydescribed in the specification and specifically pointed out in theclaims.

In the accompanying drawings, which illustrate one embodiment of theinvention, and

in which like characters of reference indicate the same parts, Figure 1represents, diagram matically, partly in elevation and partly insection, so much of a boiler constructed in accordance with theinvention as is necessary to an understanding thereof. Fig. 2 is ahorizontal sectional plan view of a part of the boiler shown in Fig. 1,the section being taken on the line 2 2 of this figure. Fig. 3 is ahorizontal sectional detail illustrating a modification.

Referring to Fig. 1, which represents one of the types of boiler inwhich the invention may be embodied, 1 indicates a grate. In the form ofboiler selected to illustrate the (No model.)

tionbeing well understood and the type of boiler being a familiar one.

On the outer sidesof the two grates are 10* -cated Water-drums 2 and 3,and between these grates islocated another water-drum 4. Rising fromthese water-drums are groups of tubes, which are marked 6, 7, 8, and 9,respectively. These tubes serve to connect the waterdrums with the steamseparating means and are located within the usual casing- 10. In theform of boiler shown the steam-separating means consist of a singlesteam-drum, and this is the preferred construction. The invention isnot, however, limited to boilers employing a single steam drum, as itmay be applied to boilers having more than one such drum.

In the form of boiler shown the groups 0 tubes 6 and 9 are shown asconnecting the water-drums 2 and 3 with the top of the steamdrum or withthat part of the drum which is above the normal water-level, while thegroups of tubes 7 and S are shown as connecting the water-drum 4 withthe lower part of the steam-drum 501* that part of the drum which isbelow the normal water-level. It is to be understood, however, that thisarrangement of'the tubes, while it is considered a desirable one, is notnecessary to the invention. If desired, all the tubes may be broughtinto the steam-drum below the normal water-level thereof, or all thetubes may be brought into.

said drum above the normal water-level, or any desired proportion of thetubes may be connected with the drum below the waterlevel.

In order that the full heating power of the products may be utilized, itis desirable that they be kept in contactwith the groups of tubes aslongas possible and yet insure a free draft. The several tubes of each ofthe groups 6, 7, 8, and 9 are therefore so arranged as to formlongitudinal passages lengthwise of the boiler, the products beingadmitted to these passages and caused to pass along them, The productsare preferably admitted to the passages formed by the several groups oftubes substantially at one end thereof. The products thus come intocontact at least once with tubes 60 or the tubes nearest the combuse.

tion-chaluber of the group 6 and the outer tubes 61 of the same groupwill be arranged close together, seats to form .walls with a pas sagebetween them, in which passage the remaining tubes 62 of the group arelocated. In

the same way the tubes 70 and 71 of the group oftubes 7 are preferablyarranged to form a passage in which the tubes72 are located,

and the tubes 80 and 81 of the group 8 andthe tubes 90 and 91 ofthegroup 9 are also a similarly arranged to form passages in whichthe tubes82 and 92 are located.

not limited to this'construction. The walls,

for instance, might be formed partly of tubes and partly of othersuitable material, such as fire-brick or asbestos, the tubes beingspaced apart and the fire-brick, asbestos, or other suitable materialbeing'located in the spaces between the tubes, or the walls of' the passages might be formed of tubes used in connection with sheets offire-brick, asbestos, or other suitable material, such sheets beinglocated either inside or outside the. wall of tubes.

are composed entirely of tubes.

In the construction shown the walls formed ing from the water-drum tothe steam-drum. In the same way'the walls formed by the tubes ,70 and 71are shown as extending from the water-drum 4'to the steam-drum. In thisconstruction, therefore, the passage formed by the tubes 60 and 61 isentirelyindependent of the passage formed by the tubes 70 and 71.

' Theproducts which enter these two passages are carried through themand each passage delivers its products intoa chamber 11, which in'theform of boiler shown is located at the rear. This chamber communicates'witha stack 12, also located at the rear in the form of boiler shown.If desired, however, the tubes forming the walls and maybe spread apartat the points where they join the steamdrum or from such points for aconsiderable distancebackward, so as to form along the steam-drum acommon passage for the prodnets-that is to say,a part. of the productsadmitted into the passage between the tubes 60 and-61 will as they passalong the steamdrum mingle with a part of the products ad mitted intothe passage between the tubes 7 O and 71. In this case the tubes 61 willform the top of a longitudinal passage extending along the steam-drumand the tubes 71 will The preferred form is that, however, illustrated,in which the walls of the passages formthe -bottom of said passage. Thetubes in the groups 8 and 9 may also be arranged eithr to form twoentirely independent passages or they may form passages which areconnected at the top. Each group of the groupsof tubes 6, 7, 8,:and 9may also be arranged, if desired, so as to form a plurality of passageswhich extend along and are parallel to thes'tfiflm-drum, the walls ofthese passages being formed by'an arrangement of tubes or of baffles, orof both.

The products'are preferably admitted substantially at one end of thepassages formed by the several I groups of tubes, so that they may passalong the entire passage. The products thus come into contact at leastonce with all the tubes of each group and the products from the rearpart of the fire are caused to 'comeinto contact twice with the tubesnearest the combustion-chamber. The products 1 may, however, beintroduced into thepas- While it is preferred to form the walls of: thepassages entirely of tubes placed close together, as before stated, theinvention is sages elsewhere than at the ends, if desired.

When the products are to be admitted to the passages at or substantiallyat the ends, this maybe eifected in various ways In Fig. 2 the productsare shown as admit- ;ted-to the passages through openings 63 73 83,:which are formed by omitting altogether or reducing the number of tubes60, 70, and 80, which form the walls next the combustionchamerthepassage formed by the tubes and 91 in {the same manner; but'it isconsidered unnecessary to show this construction;

"In the modification illustrated in Fig. 3a flue 13 is arranged acrossthe front of the boiler, which flue com mu nic'at'es both withthecomibllstion-chamber and with the passages be- I tween theseveral'groups of tubes;

by the tubes 60 and 61 are shown as extend- The products will'beadmitted to In the preferredform of the construction jthe products ofcombustion are taken in at or substantially at one endof the passagesformed by the several groups of tubes and are caused to pass along saidpassages and ;directly out'v at their opposite 'ends. n ay, however, beadmitted to the passages elsewherethan at the ends, if desired.

In some cases, how- Insuch cases and in some othersit maybe founddesirable to divide the passages formed by the groups of tubes either byarranging som'e of thein- 1 ner tubes to form a wall or by asuitably-lo- In boilers as ordinarily constructed it will ;usually befound that the heating qualities {of 'theproducts have been sufficientlyize'd bypassing once through the passage as :heretofo're described.ever, wherethe vertical height of the space in which th'e'boiler'is tobe placed is necessarily'small and the upper steam-drum has to be placedvery near the lower drums and grates, it may happen that theconstruction described will not sufliciently utilizethe heatingqualities of the products.

of course the flue and stack will be located at that end of the boilerat which it is desired to have the products escape.

The water-drums may be connected to each other and to the steam-drum ordirectly to the steam-drum by any usual or desired arrangement ofdowntake-tubes.

It is not intendedthat the products shall enter the space between theinner groups of tubes. Suitable baflie-plates 14 may, if desired, bearranged along the inner sides of the inner groups of tubes in order toprevent the products from passing between the tubes at this point.

Any usual form of baffle or steam-separating plate may be used in thesteam-drum, and such a construction is indicated at 15.

It will be noted that the individual tubes of each of the groups oftubes are bent, and this is the preferred construction, because of thewellknown advantages which result from the use of such bent tubes. Theinvention is not, however, confined to the use of bent tubes. Straighttubes may be used, ifdesired, or the groups of tubes may be made uppartly of bent and partly of straight tubes.

Other changes in the construction of the boiler are possible and willsuggest themselves to skilled mechanics. The invention is not thereforeto be limited to the particular construction shown and described.

'What I claim is-- 1. In a steam-boiler, the combination with a stearn-d rum, of a grate, water-dru ms located C on each side thereof,groups of bent tubes connecting the steam-drum with the waterdrums, apart of the tubes of each group being arranged in passages for theproducts of combustion which run longitudinally of the boiler, theremainder of the tubes being arranged in the walls of said passages, andmeans whereby the products are admitted substantially at one end of saidpassages and allowed to escape at the opposite ends, substantially asdescribed.

2. In a steam-boiler, the combination with two grates, of water-dru mslocated on the outer sides thereof, a water-drum located between thegrates, steam-separating means, four groups of bent tubes connecting thewater-drum with the steam-separating means, some of the tubes of eachgroup being arranged in passages for the products of combustion whichrun longitudinally of the boiler, and some of the tubes being arrangedin the walls of said passages, and means whereby the products areadmitted at one end of the passages and allowed to escape from theother, substantially as described.

3. In a steam-boiler, the combination with a grate, of a water-drumlocated on each side thereof, a steam-drum, groups of bent tubesconnecting the water-drums with the steamdrum, some of the tubes of eachgroup being arranged in passages for the products of combustion whichrun longitudinally of the boiler and some of the tubes being arranged inthe walls of said passages, the said walls extending from the steam-drum to the water-drums whereby the passage formed by each grou p of tubesis independent of the passage formed by the adjoining group, and meanswhereby the products are admitted to the passages, substantially asdescribed.

4. In a steam-boiler, the combination with a grai e, of a water-drumlocated on each side thereof, a steam-drum, groups of bent tubesconnecting the water-drums with the steaim drum, some of the tubes ofeach group being arranged in passagesfor t he products of combustionwhich run longitudinally of the boiler and some of the tubes beingarranged in the walls of said passages, the said walls extending fromthe steam-drum to the water-drums, whereby the passage formed by eachgroup of tubes is independent of the passage formed by the adjoininggroup, and means whereby the products are admitted at one end of saidpassages, substantially as described.

5. In a steam-boiler, the combination with a grate, of a water-drumlocated on each side thereof, a steam-drum, groups of tubes connectin gthe waterdrums with the steamdrum, some of the tubes of each group beingarranged in passages for the products of combu stion which runlongitudinallyof the boiler and some of the tubes being arranged in thewalls of said passages, the said walls extending from the steam-drn m tothe water-drums whereby the passage formed by each group of tubes isindependent of the passage formed by the adjoining group, and meanswhereby the products are admitted at one end of the passages and allowedto escape from the other, substantially as described.

6. In a steam-boiler, the combination with a steam-drum, of a pluralityof grates, waterdrums located at the outer sides of the grates, awaterdrum between adjoining grates, groups of bent tubes connecting thesteamdrum with the several water-drums, some of the tubes of each groupbeing arranged in passages for the products of combustion which runlongitudinally of the boiler, and some of the tubes being arranged inthe walls of said passages, and means whereby the products of combustionare admitted substantially at one end of said passages and allowed toescape at the opposite ends, substantially as described.

7. In a steam-boiler, the combination 33th a steam-drum, of a pluralityof grates, waterq drums located at the outer sides of the grates, awaterdrum between adjoining grates, groups of bent tubes connecting thesteamdrum with the several water-drums, some of the tubes of each groupbeing arranged in passages for the products of combustion which runlongitudinally of the boiler, the tubes which form the walls of thepassages which are next the combustion-chamber being arranged so as toadmit the products at one end of the said passages, substantially asdescribed.

8. In a steam-boiler, the combination with asieamd r'um,of apluralityofgrates, water-- drums located at the outer sides of the grates,i awater-drum between ,two grates, groups of bent tubes connecting thesteam-drum with the water-drums,some of the tubes of each group beingarranged in passages for the products of combustion which runlongitudinally;

passage formed by the adjoining group, and

means whereby the products are admitted at one end of said passages,substantially as described.

t 9. Ina steam-'boilerpthe combination with;

a steam-'drum,of.,a plurality of grates, water.- drums located at theouter sides of the grates, a-water-drum adjoining two grates, groups ofbent tubes connecting the steam-drum with the water-drums, some of-the'tubesof each group being'arranged in passages for the prod- ;ucts ofcombustion which ,run longitudinally of the boiler, and some of thetubes being arranged in theiwalls of said passages and the said wallsextending from the steam-drum to the water-drum, whereby the passageformed by each group oftubes is independent of the passage forined bytheadjoininggroup,means whereby the products are admitted at one end of;said passages, and a flue and stack arranged at theother end of saidpassages and with which said passages communicate, subistantially asdescribed. a

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

. l JOHN PLATT.

Witnesses: I a

I A. V. BOURKE,

- T. F. KEHOE.

